EP 3410141 A3 20190102 - NMR MEASUREMENT APPARATUS AND MAGNETIC FIELD MAP CALCULATION METHOD
Title (en)
NMR MEASUREMENT APPARATUS AND MAGNETIC FIELD MAP CALCULATION METHOD
Title (de)
NMR-MESSVORRICHTUNG UND VERFAHREN ZUR BERECHNUNG DER KARTE EINES MAGNETISCHEN FELDES
Title (fr)
APPAREIL DE MESURE À RÉSONANCE MAGNÉTIQUE NUCLÉAIRE ET PROCÉDÉ DE CALCUL D'UNE CARTE DE CHAMP MAGNÉTIQUE
Publication
Application
Priority
JP 2017109776 A 20170602
Abstract (en)
[origin: EP3410141A2] An offset map is determined in advance by a preliminary measurement process. A phase map is generated by execution of a long Ä pulse sequence. A magnetic field map is calculated based on a phase map and a phase offset map. A shim adjustment is performed based on the magnetic field map. The offset map is calculated based on a first phase map acquired by execution of a first pulse sequence, a second phase map acquired by execution of a second pulse sequence, and a ratio ± related to phase evolution periods.
IPC 8 full level
G01R 33/24 (2006.01); G01R 33/3875 (2006.01); G01R 33/46 (2006.01); G01R 33/56 (2006.01)
CPC (source: EP US)
G01R 33/0017 (2013.01 - US); G01R 33/243 (2013.01 - EP US); G01R 33/3875 (2013.01 - EP US); G01R 33/443 (2013.01 - US); G01R 33/4625 (2013.01 - EP US); G01R 33/5608 (2013.01 - EP US); G01R 33/5615 (2013.01 - US)
Citation (search report)
- [IY] J. P. MARQUES ET AL.: "Evaluation of a new method to correct the effects of motion-induced B0-field variation during fMRI", PROCEEDINGS OF THE INTERNATIONAL SOCIETY FOR MAGNETIC RESONANCE IN MEDICINE, ISMRM, 13TH SCIENTIFIC MEETING AND EXHIBITION, MIAMI BEACH, FLORIDA, USA, 7-13 MAY 2005, 23 April 2005 (2005-04-23), XP040593194
- [IY] FRANCK LAMBERTON ET AL: "A new EPI-based dynamic field mapping method: Application to retrospective geometrical distortion corrections", JOURNAL OF MAGNETIC RESONANCE IMAGING, vol. 26, no. 3, 29 August 2007 (2007-08-29), US, pages 747 - 755, XP055525833, ISSN: 1053-1807, DOI: 10.1002/jmri.21039
- [IY] BENJAMIN ZAHNEISEN ET AL: "Quantification and correction of respiration induced dynamic field map changes in fMRI using 3D single shot techniques : Respiration Induced Field Map Dynamics", MAGNETIC RESONANCE IN MEDICINE., vol. 71, no. 3, 28 May 2013 (2013-05-28), US, pages 1093 - 1102, XP055525836, ISSN: 0740-3194, DOI: 10.1002/mrm.24771
- [IY] BARBARA DYMERSKA ET AL: "A method for the dynamic correction of B 0 -related distortions in single-echo EPI at 7 T", NEUROIMAGE, vol. 168, 7 July 2016 (2016-07-07), AMSTERDAM, NL, pages 321 - 331, XP055525839, ISSN: 1053-8119, DOI: 10.1016/j.neuroimage.2016.07.009
- [Y] A. ALHAMUD ET AL.: "Real-Time Shim Correction during Functional MRI Using a Volumetric Navigator", PROCEEDINGS OF THE INTERNATIONAL SOCIETY FOR MAGNETIC RESONANCE IN MEDICINE, ISMRM, 23RD ANNUAL MEETING AND EXHIBITION, TORONTO, ONTARIO, CANADA, 30 MAY - 5 JUNE 2015, no. 356, 15 May 2015 (2015-05-15), XP040666039
- [YA] BAO QINGJIA ET AL: "A new gradient shimming method based on undistorted field map ofB0inhomogeneity", JOURNAL OF MAGNETIC RESONANCE, ACADEMIC PRESS, ORLANDO, FL, US, vol. 265, 21 December 2015 (2015-12-21), pages 25 - 32, XP029486223, ISSN: 1090-7807, DOI: 10.1016/J.JMR.2015.12.008
- [A] L. MARTYN KLASSEN ET AL: "Robust automated shimming technique using arbitrary mapping acquisition parameters (RASTAMAP)", MAGNETIC RESONANCE IN MEDICINE., vol. 51, no. 5, 26 April 2004 (2004-04-26), US, pages 881 - 887, XP055526031, ISSN: 0740-3194, DOI: 10.1002/mrm.20094
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3410141 A2 20181205; EP 3410141 A3 20190102; EP 3410141 B1 20220420; JP 2018205080 A 20181227; JP 6954767 B2 20211027; US 10877119 B2 20201229; US 2018348320 A1 20181206
DOCDB simple family (application)
EP 18175145 A 20180530; JP 2017109776 A 20170602; US 201815995506 A 20180601